CN106591554B - A kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property - Google Patents
A kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property Download PDFInfo
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- CN106591554B CN106591554B CN201610867465.6A CN201610867465A CN106591554B CN 106591554 B CN106591554 B CN 106591554B CN 201610867465 A CN201610867465 A CN 201610867465A CN 106591554 B CN106591554 B CN 106591554B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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Abstract
A kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property：Conventional smelting, slab, hot rolling are simultaneously batched；Steel plate is preheated after pickling and normalizing；Carry out once cold rolling：First passage mill speed is not less than 200m/min；Emulsion unilateral side spray；Second passage is to passes speed third from the bottom in 400 ~ 600 m/min；Emulsion is using unilateral spray；Timeliness rolling temperature is at 180 ~ 350 DEG C, and total aging time is in 13 ~ 47min；Last two passage is common rolling mode, and emulsion is that double survey sprays and be full-gear；Process after progress.Non-energy-consumption of the present invention increases, only existing equipment adjusts technique by a relatively large margin, so that total timeliness rolling time is reached 13 ~ 47min, and extend to 7 ~ 37min in the aging time of 251 ~ 350 DEG C of sections, so that cold rolling aging technique is improved primary recrystallization, makes finished product magnetism B800 energyImprove 0.01 ~ 0.04T.
Description
Technical field
The present invention relates to a kind of milling method of orientation silicon steel, specifically belong to a kind of to improve the high magentic induction oriented silicon of low temperature
The once cold rolling method of steel magnetism.
Background technique
High temperature rolling technology is compared with conventional cold rolling with relatively-high temperature（≥180℃）, big the characteristics of depressing, technology master
It is higher to be used for silicon content（3.3%~3.5%）High-performance HiB steel, when using the purpose of high temperature rolling being to generate cold rolling
Effect improves the magnetic strength of oriented steel and reduces iron loss.On the other hand, since the silicon content of orientation silicon steel is continuously improved, material can become
Must be more and more crisp, deteriorate its processing performance, the plasticity of cold rolled silicon steel is improved using high temperature rolling technique, substantially increases silicon
The aptitude to rolling of steel.
The milling method of orientation silicon steel once rolling and rolling, so-called rolling twice are referred to two twice
There are intermediate annealing processes between secondary rolling, and the purpose is to reduce single pass drafts, inhibitor in steel band is broken in reduction
It is bad, necessary condition is provided for growing up for secondary recrystallization.Since a rolling is simple more at low cost than secondary cold-rolling method process, and
By heating up, rolling carries out timeliness between passage, and improving steel band magnetism reduces iron loss, and high magnetic induction grain-oriented silicon steel mostly uses one at present
Secondary rolling production.
Low temperature high magnetic induction grain-oriented silicon steel（Low temperature HIB steel）It is using reduction slab heating temperature production high magnetic induction grain-oriented silicon steel
Method.There is strict demand to steel-making ingredient and hot rolling technology, while also to carry out Nitrizing Treatment after decarburizing annealing, supplement suppression
Preparation.Since slab heating temperature is low, the solid solution of congenital inhibitor is less, act on it is weaker, therefore after low temperature HIB steel decarburization it is primary again
Crystal grain is bigger than high temperature HIB steel, and uneven, this is end properties fluctuate after causing low temperature HIB steel secondary recrystallization one
A importance.There is provided more nucleation sites by ageing treatment for primary recrystallization, improve primary recrystallization crystal grain position to
Crystallite dimension.
Carbon exists after Hot Rolled Plate Normalizing to be dissolved carbon and tiny ε-carbide morphology, anchoring dislocation when cold rolling, dislocation density
Obviously increase, processing hardening faster, when annealing recrystallizes raw nuclear location and increases, first uniform small grains, promotes secondary to tie again
Brilliant development.Cold rolling timeliness can make to be dissolved carbon in silicon steel and nitrogen content increases, even if unstable carbide present in steel
(Fe3) and nitride (Fe C16N4) the decomposition solid solution when heating up rolling.Carbon is dissolved when cold rolling and nitrogen is gathered at dislocation, hinders position
Wrong Shipment is dynamic, and dislocation group is arranged in a linear, and changes normal slip system, promotes to form more intermediate zones, makes to tie again after cold rolling
Brilliant texture changes.
{111}<112>Texture is the Main Texture in high magnetic induction grain-oriented silicon steel decarburization plate, is enhanced { 111 }<112>Texture has
Strong and sharp G0SS texture is obtained in crystallization heating process conducive to secondary.When making cold rolling between each cold rolling pass of HiB steel
Effect can improve the dislocation configuration in steel plate, enhance the formation of more cold rolling shear bands, and then promote after primary recrystallization { 111 }<
112>The enhancing of texture.
Through retrieving：
China Patent Publication No. is the document of CN1059369A, discloses a kind of preageing method production CRYSTALLITE SIZES configuration
The method of silicon steel is smelted, the strip work of casting, hot rolling and normalizing slow cooling with usual high-magnetic induction, low-iron loss cold-rolled orientation silicon steel technique
Raw material, the silicon steel produced through once cold rolling method.It is characterized in that being kept before cold rolling at the preparatory timeliness more than 5 seconds and less than 10 hours
Reason constitutes timeliness-cold rolling-timeliness-cold rolling-timeliness ... and is rolled to final finished thickness.Ageing treatment is that N, C atom exist between passage
Precipitation is gathered in the field at micro-defect such as dislocation between cold rolling pass, forms KESHI gas mass pinning dislocation, keeps deformation difficult, produces advantageous
In the special deformed microstructure of secondary recrystallization.Strip preheating temperature before cold rolling is low and preheating time is short or timeliness rolling pass is few
In the case where carry out " rolling of interior thickness timeliness ", can only obtain the spindle-type crystal grain such as big, then iron loss raising, magnetic strength are also low.With
Upper method think before rolling and per pass between will carry out ageing treatment, it is magnetic to can be improved high magnetic induction grain-oriented silicon steel finished product, but
Implementation needs additional heating and heat preservation, can not adapt to the requirement of high-efficiency and continuous production.
China Patent Publication No. is the document of CN104894354A, discloses a kind of Low Temperature Hot Rolling plate preparation high magnetic of thin gauge
Feel the production method of orientation silicon steel wherein cold rolling process by 6-8 cold rolling pass by the hot rolled plate finish to gauge for a thickness of
The cold-reduced sheet of 0.16-0.18mm, wherein the reduction ratio of each cold rolling pass is 20%-40%.Timeliness is carried out between cold rolling pass
Heat treatment：The hot rolled plate is placed in Equipment for Heating Processing, keeps the temperature 5-10min at 240-250 DEG C.The document is required in per pass
5-10min ageing treatment is all carried out between secondary, it is seen that prolonged ageing treatment takes in the production high magnetic strength of Low Temperature Hot Rolling plate thin gauge
Importance when to silicon steel.But the method, which needs to heat and keep the temperature between passage, carries out timeliness, can not adapt to continuous production requirement.
China Patent Publication No. is the document of CN102114493A, discloses the orientation silicon steel of a kind of high magnetic strength, low iron loss
Production technology, feature：Roll change method twice is produced and used using mill, and production technology comprises the concrete steps that exist first
The pre-heat treatment for carrying out 80~100 DEG C before milling train production to strip, is then rolled, is given birth to using mill
Produce, using secondary roll change method, before passage work roll surface roughness Ra at 0.5 μm or more, so that belt steel temperature is increased to 250 DEG C
8~12 minutes ageing treatments are carried out after above, then are rolled down to the thickness of finished product, this passage work roll surface roughness Ra <
0.25 μm, to obtain required finished product.This method can increase asperities roller roughness, so that improving heating rate realizes timeliness
Rolling, main problem is that aging time is shorter, and temperature is not high enough.
China Patent Publication No. is the document of CN102127709A, discloses a kind of high magentic induction oriented silicon of low temperature heating of plate blank
Steel and manufacturing method, wherein cold rolling：High magnetic induction grain-oriented silicon steel generally uses once cold rolling technique, and high magnetic induction grain-oriented silicon steel deformation is anti-
Power is big, generally in 20 roller mill cold rollings, is cold rolled to target thickness through 5~7, and average per pass reduction ratio is 25%~33%.It closes
Suitable total reduction is 82%~90%.To further decrease iron loss, cold rolling aging technique is widely used in production now.It is former
Road uses asperities working roll, and per pass closes lubricating system and fast speed rolling through about 30% heavy reduction rate cold rolling.When by rolling
Cold-rolled strip temperature is increased to 200 DEG C or so by deformation heat.This method is the cold rolling of low-temperature slab heating high magnetic induction grain-oriented silicon steel
Method, but the aging temp required in document is relatively low, and does not require timeliness passage and time, is unfavorable for magnetic levels
It further increases.
China Patent Publication No. is the document of CN104726668A, discloses one kind and efficiently produces high magnetic induction grain-oriented silicon steel
Method, it is mentioned that normalizing plate carries out 4~5 passes after pickling；1st passage is controlled using oily rolling, percentage pass reduction is closed
30%~40%, cold rolling total reduction is 80%~90%.More transition interbands can be formed using the cold-rolling practice rolling mill practice, increased
The nucleation site of Gauss crystal grain is added.The document is also related to a rolling production method of high magnetic induction grain-oriented silicon steel, but clock synchronization
Effect temperature and time is not distinctly claimed.
Summary of the invention
The present invention partially short, timeliness for aging time present in existing low temperature high magnetic induction grain-oriented silicon steel once cold rolling technology
The problems such as temperature is relatively low or needs additional heating and thermal insulation, is unfavorable for continuous production, provides one kind and total timeliness rolling time is allowed to reach
Aging time to 13 ~ 47min, and 251 ~ 350 DEG C of temperature sections extends to 7 ~ 37min, does not influence production efficiency, and make finished product
Magnetic B800Improve the cold rolling process of 0.01 ~ 0.04T.
Realize that the measure of above-mentioned purpose is as follows：
A kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property, step：
1）Conventional smelting, slab, hot rolling are simultaneously batched；
2）Steel plate is preheated to not less than 50 DEG C after conventional pickling and normalizing；
3）Once cold rolling is carried out, rolling pass is 5 ~ 7 passages, and step is：
A, first of secondary control mill speed is not less than 200m/min；Emulsion is no more than using unilateral spray, flow
500L/min；Rolling temperature control is not less than 140 DEG C；
B, the second passage is to passage controlled rolling speed third from the bottom in 400 ~ 600 m/min；Emulsion is using unilateral spray
Leaching, flow control is in 1000 ~ 1500L/min；Enter timeliness as-rolled condition when rolling temperature is to 180 DEG C；Timeliness rolling temperature exists
180 ~ 350 DEG C, total aging time control is in 13 ~ 47min, wherein when timeliness rolling temperature is between 251 ~ 350 DEG C, timeliness
Time controls in 7 ~ 37min；
C, last two passage uses common rolling mode, and emulsion surveys spray using double, and emulsification flow quantity is standard-sized sheet shape
State；
4）Process after conventional progress.
It is：In the first passage into the passes of falling third, rolling temperature and rolling pass positive correlation.
Why coil of strip is preheated to not less than 50 DEG C by the present invention, is to generate in brittleness temperature region deformation
Deformation and disconnected band also provide basic condition for subsequent heating rolling.
Why the present invention controls the first passage mill speed not less than 200m/min, and second to passage third from the bottom rolls
Speed processed is not less than 400m/min, and emulsification flow quantity uses single spraying Small Flow Control, and purpose is provided to rapid lifting plate temperature, most
Reach timeliness rolling temperature fastly.
Why the present invention controls the rolling deformation temperature of the first passage after >=140 DEG C, is to guarantee from second
Passage starts rolling temperature and is promoted to 180 DEG C or more, enters timeliness as-rolled condition in advance；The time control of 251 ~ 350 DEG C of temperature sections
System is that rolling timeliness effect is performed to maximum in order to extend timeliness rolling in the residence time of higher temperature in 7 ~ 37min.
Extend aging time, improving highest aging temperature is to make more tiny carbide and nitride solid
It is molten, more anchorings are formed in cold-rolled process, changes normal slip system, promotes to form more intermediate zones, are primary recrystallization
More nucleation sites are provided, improve primary recrystallization crystal grain position to and crystallite dimension；Tiny carbide can also the transgranular dislocation of pinning,
It generates { 111 }<112>(gamma fiber texture), while preventing (110) (001) (goss texture) crystal grain of steel sheet surface layer past
{111}<112>Direction rotation, is easy to generate GOSS texture, is conducive to the perfect of secondary recrystallization and stablizes, makes secondary recrystallization
Finished product magnetism improves afterwards.
Compared with prior art, the present invention Non-energy-consumption and the production cost increases, only rely on existing equipment to technique carry out compared with
It significantly adjusts, so that total timeliness rolling time is reached 13 ~ 47min, and the aging time of 251 ~ 350 DEG C of temperature sections extends to 7
~ 37min has given full play to cold rolling aging technique to the improvement result of primary recrystallization, has not influenced live continuous production, make finished product
Magnetic B800 energyImprove 0.01 ~ 0.04T.
Specific embodiment
The present invention is described in detail below：
Each case study on implementation of the present invention follows the steps below production：
1）Conventional smelting, slab, hot rolling are simultaneously batched；
2）Steel plate is preheated to not less than 50 DEG C after conventional pickling and normalizing；
3）Once cold rolling is carried out, rolling pass is 5 ~ 7 passages, and step is：
A, first of secondary control mill speed is not less than 200m/min；Emulsion is no more than using unilateral spray, flow
500L/min；Rolling temperature control is not less than 140 DEG C；
B, the second passage is to passage controlled rolling speed third from the bottom in 400 ~ 600 m/min；Emulsion is using unilateral spray
Leaching, flow control is in 1000 ~ 1500L/min；Enter timeliness as-rolled condition when rolling temperature is to 180 DEG C；Timeliness rolling temperature exists
180 ~ 350 DEG C, total aging time control is in 13 ~ 47min, wherein when timeliness rolling temperature is between 251 ~ 350 DEG C, timeliness
Time controls in 7 ~ 37min；
C, last two passage uses common rolling mode, and emulsion surveys spray using double, and emulsification flow quantity is full-gear；
4）Process after conventional progress.
1 ~ table of table 3 is the technological parameter list of various embodiments of the present invention and comparative example；
Table 4 is the end properties list of various embodiments of the present invention and comparative example.
1 finished product thickness of table is the technique of 0.30mm product:
2 finished product thickness of table is the technique of 0.23mm product
3 finished product thickness of table is the technique of 0.18mm product
The end properties list of 4 various embodiments of the present invention of table and comparative example
Present embodiment is only the best example, not to the limited implementation of technical solution of the present invention；Each embodiment
Technological parameter is not corresponding relationship yet.
Claims (2)
1. a kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property, step：
1）Conventional smelting, slab, hot rolling are simultaneously batched；
2）Steel plate is preheated to not less than 50 DEG C after conventional pickling and normalizing；
3）Once cold rolling is carried out, rolling pass is 5 ~ 7 passages, and step is：
A, first of secondary control mill speed is not less than 200m/min；Emulsion is no more than 500 L/ using unilateral spray, flow
min；Rolling temperature control is not less than 140 DEG C；
B, the second passage is to passage controlled rolling speed third from the bottom in 400 m/min or 450 ~ 600 m/min；Emulsion is adopted
It is sprayed with unilateral side, flow control is in 1000 ~ 1500L/min；Enter timeliness as-rolled condition when rolling temperature is to 180 DEG C；Timeliness is rolled
Temperature processed is at 180 ~ 350 DEG C, and total aging time control is in 13 ~ 47min, wherein timeliness rolling temperature is between 251 ~ 350 DEG C
When, aging time is controlled in 7 ~ 37min；
C, last two passage uses common rolling mode, and emulsion surveys spray using double, and emulsification flow quantity is full-gear；
4）Process after conventional progress.
2. a kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property described in claim 1, feature
It is：In the first passage into passes third from the bottom, rolling temperature and rolling pass positive correlation.
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| CN201610867465.6A CN106591554B (en) | 2016-09-30 | 2016-09-30 | A kind of once cold rolling method that can improve low temperature high magnetic induction grain-oriented silicon steel magnetic property |
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| CN108817081A (en) * | 2018-06-13 | 2018-11-16 | 武汉钢铁有限公司 | The milling method of silicon steel |
| CN111334653B (en) * | 2020-03-26 | 2022-03-15 | 武汉钢铁有限公司 | High magnetic induction oriented silicon steel and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06264145A (en) * | 1993-03-12 | 1994-09-20 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet excellent in magnetic property |
| JPH10195537A (en) * | 1997-01-07 | 1998-07-28 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet having stably excellent magnetic property |
| CN102041368A (en) * | 2011-01-16 | 2011-05-04 | 首钢总公司 | Method for producing oriented electrical steel with excellent surface quality |
| CN102114493A (en) * | 2010-10-14 | 2011-07-06 | 新万鑫（福建）精密薄板有限公司 | High-magnetic induction and low-iron loss oriented silicon steel production process |
| CN104399749A (en) * | 2014-10-28 | 2015-03-11 | 武汉钢铁(集团)公司 | Cold rolling method capable of preventing edge crack and brittle fracture of silicon steel with Si content more than or equal to 3.5 percent |
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- 2016-09-30 CN CN201610867465.6A patent/CN106591554B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06264145A (en) * | 1993-03-12 | 1994-09-20 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet excellent in magnetic property |
| JPH10195537A (en) * | 1997-01-07 | 1998-07-28 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet having stably excellent magnetic property |
| CN102114493A (en) * | 2010-10-14 | 2011-07-06 | 新万鑫（福建）精密薄板有限公司 | High-magnetic induction and low-iron loss oriented silicon steel production process |
| CN102041368A (en) * | 2011-01-16 | 2011-05-04 | 首钢总公司 | Method for producing oriented electrical steel with excellent surface quality |
| CN104399749A (en) * | 2014-10-28 | 2015-03-11 | 武汉钢铁(集团)公司 | Cold rolling method capable of preventing edge crack and brittle fracture of silicon steel with Si content more than or equal to 3.5 percent |
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